EUVD-2026-68538
GHSA-q54q-3xc2-qwqp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated network POST alters WAN config, so primarily integrity (I:H) with secondary traffic-redirection confidentiality (C:L) and connectivity-disruption availability (A:L); PR:N/AC:L per the missing auth check.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setWanIeCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reconfigure uplink settings via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Uplink/WAN reconfiguration in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) can be performed by unauthenticated remote attackers because the setWanIeCfg handler fails to enforce access control on the /cgi-bin/cstecgi.cgi endpoint. An attacker on a reachable network can silently rewrite the device's uplink settings, enabling traffic redirection or connectivity disruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the router's HTTP management service and the ability to POST to the /cgi-bin/cstecgi.cgi endpoint invoking the setWanIeCfg function; per CVSS PR:N/UI:N no authentication or user interaction is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, score 9.1) rates this critical: network-reachable, low complexity, no privileges, no user interaction, consistent with the description of unauthenticated reconfiguration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched firmware version is identified in the provided data, so no fixed build can be cited at time of analysis; monitor the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-51675) for an update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 in your environment and restrict access to router management interfaces to closed, trusted networks only. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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